take a look at the dayton timberline M/T's i had some 265/75/R16 on my 01 dually and got good mileage out of them. i got about 40,000 out of them. just keep them rotated and air in them. i probably could have gotten more but i was hualing a John Deere 650 bulldozer all over the place. so obviously with the weight they wear a little quicker. and they are fairly inexpensive. i think i bought 6 tires for $159.00 each. it was right at $1000 for mounting balancing and the tires

Were can I find the timberlines?

Had a set of 33 x 12.50 Pro Comp Mud Terrains on my truck before these Extreme A/T's. Got nearly 40,000 miles out of them, but was really anal about rotating them every 3000 miles.

DynaPro RT03 MTs... they were super quiet.. and did great in the mud.. havent had a truck long enough to see how long they last.. I had about 30k on a set on my old 1/2ton chebby and still had about 40% left

Buckshots rock! They make a little more noise on the street but they wear VERY well and are very affordable! They pull very well in the mud also.

AT -VS- MT
 

BF Goodrich All Terrain is my vote!
I got 50,000 miles out of mine, and they still had a good summer tread left on them.

They are quiet, and they provide a great soft ride.
Besides they are a great set of mud shoes.

The Mud Terrains were only a small bit better in the mud, but not much!
Besides all that, M/T are way too noisy on the road.

Interco's M16, but you've got to have $$.